// Copyright 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CC_TREES_TREE_SYNCHRONIZER_H_
#define CC_TREES_TREE_SYNCHRONIZER_H_

#include <memory>

#include "base/macros.h"
#include "cc/base/cc_export.h"

namespace cc {

class LayerImpl;
class LayerTree;
class LayerTreeImpl;
class Layer;

class CC_EXPORT TreeSynchronizer {
public:
    // Accepts a Layer tree and returns a reference to a LayerImpl tree that
    // duplicates the structure of the Layer tree, reusing the LayerImpls in the
    // tree provided by old_layer_impl_root if possible.
    static void SynchronizeTrees(Layer* layer_root, LayerTreeImpl* tree_impl);
    static void SynchronizeTrees(LayerTreeImpl* pending_tree,
        LayerTreeImpl* active_tree);

    static void PushLayerProperties(LayerTreeImpl* pending_tree,
        LayerTreeImpl* active_tree);
    static void PushLayerProperties(LayerTree* host_tree,
        LayerTreeImpl* impl_tree);

private:
    TreeSynchronizer(); // Not instantiable.

    DISALLOW_COPY_AND_ASSIGN(TreeSynchronizer);
};

} // namespace cc

#endif // CC_TREES_TREE_SYNCHRONIZER_H_
